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| 初步设计阶段 | |||
| 概念设计阶段 | |||
| 初步〔草图〕设计阶段 | |||
| 初步设想阶段; 规划阶段; 方案设计阶段 | |||
| 概念论证阶段; 初步方案论证阶段 | |||
| 构思阶段; 草图设计阶段; 拟定阶段; 设想阶段 | |||
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concept phase : 5 phrases in 2 subjects |
| Aviation | 3 |
| Space | 2 |
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